Description:FIELD OF THE INVENTION

The present disclosure relates to fiber cables. More specifically, the present disclosure relates to a multicore fiber cable and its manufacturing process thereof.

BACKGROUND OF THE INVENTION

Transmission capacity has increased exponentially in past decades and still increasingly continuously. In order to meet the transmission demands every challenging step has been performed including enhancement of single core fiber transmission capacity through different advanced technologies, which includes spectral efficiency enhancement through optical bandwidth expansion of transmission window and space division multiplexing. Since, the single core fiber (SCF) has achieved maximum transmission capacity of about 100 Tb/s and thereby incapable of handling the growing capacity demands.

Consequently, in order to cope up with this transmission capacity demands a need of some break-through technologies. A multicore fiber (MCF) cables have emerged as one of the promising and effective solution to overcome the problem of saturation in the transmission capacity. The MCF are used to significantly increase the Shannon capacity of optical networks based on single-core fibers.

However, the existing prior art solutions are not so effective due to effect of nonlinearities in transmission. The existing multicore fiber cable has high inter-core crosstalk. Further, the existing multicore fiber cable has high dispersion of light which results in distortion of optical signal when traveling along the fiber. Furthermore, the existing multicore fiber cable shows large group delay which lowers the data transferring speed.

In view of the foregoing discussion, there exists a need to have a multicore fiber cable and its manufacturing process thereof for fast transmission of data and electrical energy.

SUMMARY OF THE INVENTION

The present disclosure seeks to provide a multicore fiber cable and its manufacturing process used in optical network designing of smart cities to provide seamless network connectivity with negligible delay.

In an embodiment, a multicore fiber cable is provided. The cable includes a plurality of trench assisted cores of a predetermined diameter embedded inside a fiber body for conducting light to transmit data and electrical energy. The plurality of trench assisted cores is prolonged along a length of the fiber body, wherein each of the cores is densely packed by a cladding of a predetermined diameter and of a predetermined thickness. The plurality of trench assisted cores are embedded inside the fiber body in a triangular lattice manner by suitably optimizing parameters to achieve a minimum value of inter-core crosstalk. The plurality of trench assisted cores are selected from 15 to 25 trench assisted cores. More particularly of 20 trench assisted cores. The predetermined diameter of the cladding is 200µm and the predetermined thickness of the cladding is 35µm. The predetermined diameter of the plurality of trench assisted cores is 6µm and predetermined diameter of the plurality of air-cores is 16µm. The trench assisted cores are operating at a specific range of wavelength which is selected from 1500nm to 1600nm for a distance of 50km to 150km of fiber length having 120mm bending radius. The inter-core crosstalk obtained herein is -220dB per 100km of fiber length.

The cable further includes, a plurality of air-cores of a predetermined diameter incorporated inside the fiber body to suppress propagation of unnecessary modes. The plurality of trench assisted cores with the plurality of air-cores are configured in a multicore fiber (MCF) structure in an optical fiber-based communication paradigm to increase transmission capacity of the plurality of trench assisted cores. The plurality of air-cores is selected from a range of air-cores including 10 to 15 air-cores. More particularly of 12 air-cores.

The cable further includes, an intermediate region surrounded by an outer coating through which the plurality of trench assisted cores and claddings extend. The intermediate region and the outer coating are configured to control the distribution of the optical mode field and thereby reduces loss. The outer coating protects intermediate coating, cladding and cores from the external effects, wherein external effects includes environmental temperature, external pressure, stress, strain and the like.

In an embodiment, a process for manufacturing a multicore fiber cable is disclosed. The process includes manufacturing a multicore optical fiber cable, the process includes implanting a plurality of trench assisted cores of a predetermined diameter inside a fiber body for conducting light to transmit data and electrical energy. The plurality of trench assisted cores is prolonged along a length of the fiber body.

The process further includes, packing each of the cores densely by a cladding of a predetermined diameter and of a predetermined thickness. The process further includes, optimizing parameters to achieve a minimum value of inter-core crosstalk by embedding the plurality of trench assisted cores inside the fiber body in a triangular lattice manner.

The process further includes, suppressing propagation of unnecessary modes by incorporating a plurality of air-cores of a predetermined diameter inside the fiber. The process further includes, configuring the plurality of trench assisted cores with the plurality of air-cores into a multicore fiber (MCF) structure in an optical fiber-based communication to increase transmission capacity of the plurality of trench assisted cores.

The process further includes, surrounding an intermediate region by an outer coating through which the plurality of trench assisted cores along with the claddings extend and thereupon controlling the distribution of the optical mode field and reducing loss by the intermediate region and the outer coating.

In an embodiment, the crosstalk (XT) is suppressed to ultra-low level (ULXT) by suppressing the propagation of unnecessary modes by incorporating the plurality of air-cores at selected places.

An object of the present disclosure is to develop a 20 trench assisted cores with 12 air-cores MCF structure.

Another object of the present disclosure is to provide ultra-low level of inter core crosstalk of -220dB per 100km of fiber length with minimum cladding diameter providing high transmission capacity.

Another object of the present disclosure is to develop optical network designing of smart cities to provide seamless network connectivity with negligible delay.

Another object of the present disclosure is to allow transmission of high data rate cables in data centers.

Another object of the present disclosure is to develop space division multiplexing (SDM) transmission cables.

Yet another object of the present invention is to deliver an eco-friendly and cost-effective multicore fiber cable.

To further clarify advantages and features of the present disclosure, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.

BRIEF DESCRIPTION OF FIGURES

These and other features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
Figure 1 illustrates a schematic block diagram of a multicore fiber cable in accordance with an embodiment of the present disclosure;
Figure 2 illustrates a flow chart of the process for manufacturing multicore fiber cable in accordance with an embodiment of the present disclosure;
Figure 3 illustrates an exemplary profile of a multicore fiber cable in accordance with an embodiment of the present disclosure;
Figures 4A and 4B illustrate a plurality of exemplary profiles of a multicore fiber cable in accordance with an embodiment of the present disclosure; and
Figures 5A, 5B, 5C, 5D, 5E, 5F, 5G, 5H, 5I, 5J, 5K AND 5L illustrates a plurality of exemplary graphs of a multicore fiber cable in accordance with an embodiment of the present disclosure.
Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have been necessarily been drawn to scale. For example, the flow charts illustrate the method in terms of the most prominent steps involved to help to improve understanding of aspects of the present disclosure. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.

DETAILED DESCRIPTION:

For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.

It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof.

Reference throughout this specification to “an aspect”, “another aspect” or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Thus, appearances of the phrase “in an embodiment”, “in another embodiment” and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.

The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of steps does not include only those steps but may include other steps not expressly listed or inherent to such process or method. Similarly, one or more devices or sub-systems or elements or structures or components proceeded by "comprises...a" does not, without more constraints, preclude the existence of other devices or other sub-systems or other elements or other structures or other components or additional devices or additional sub-systems or additional elements or additional structures or additional components.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The system, methods, and examples provided herein are illustrative only and not intended to be limiting.

Embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings.

Referring to Figure 1, a schematic block diagram of a multicore fiber cable is illustrated in accordance with an embodiment of the present disclosure. The present disclosure facilitates high speed data transmission and high-speed electrical energy transfer using light propagation. The cable 100 includes a plurality of trench assisted cores 102 of a predetermined diameter embedded inside a fiber body 104 for high data transmission and for conducting light to transmit data and electrical energy. The plurality of trench assisted cores 102 is prolonged along a length of the fiber body 104 in a multicore structure. The plurality of trench assisted cores 102 are selected from 15 to 25 trench assisted cores 102. More particularly of 20 trench assisted cores 102. The plurality of trench assisted cores 102 are made up of a material selected from glass, silica and the like.

In an embodiment, each of the cores 102 is densely packed by a cladding 106 of a predetermined diameter and of a predetermined thickness. The predetermined diameter of the cladding 106 is 200µm and the predetermined thickness of the cladding 106 is 35µm. The plurality of trench assisted cores 102 are embedded inside the fiber body 104 in a triangular lattice manner by suitably optimizing the parameters to achieve a minimum value of inter-core crosstalk. The parameters including a refractive index of the cladding 106, trench-core, relative refractive index difference between core-cladding and cladding-trench. The predetermined diameter of the plurality of trench assisted cores 102 is 6µm. The plurality of air-cores 108 is selected from a range of air-cores 108 including 10 to 15 air-cores 108. More particularly of 12 air-cores 108. The cladding 106 is made up of a material selected from glass, silica and the like, wherein the cladding 106 has a slightly higher refractive index, the light passing down the core undergoes total internal reflection, and is thereby contained within the plurality of trench assisted cores 102.

In an embodiment, a plurality of air-cores 108 of a predetermined diameter is incorporated inside the fiber body 104 to suppress propagation of unnecessary modes. The plurality of trench assisted cores 102 with the plurality of air-cores 108 are configured in a multicore fiber (MCF) cable structure in an optical fiber-based communication paradigm to increase transmission capacity of the plurality of trench assisted cores 102. The predetermined diameter of the plurality of air-cores 108 is 16µm.

In an embodiment, an intermediate region 110 surrounded by an outer coating 112 through which the plurality of trench assisted cores 102 and claddings 106 extend, wherein the intermediate region 110 and the outer coating 112 are configured to control the distribution of the optical mode field and thereby reduces loss. The outer coating 112 interface comprises a down-doped material that is configured to truncate the respective modefield distributions of each of the plurality of trench assisted cores 102 proximate to the outer coating 112, thereby minimizing overlap therebetween. The distance between the plurality of cores 102 and the coating interface is configured to minimize loss.

In an embodiment, the intermediate region 110 is doped to have a refractive index difference of approximately -0.0012 relative to pure silica, so as to minimize evanescent field tails beyond the material of each cladding 106 of the plurality of trench assisted cores 102. The outer coating 112 is configured to have an index less than or equal to that of the cladding index.

In an embodiment, the trench assisted cores 102 are operating at a specific range of wavelength which is selected from 1500nm to 1600nm for a distance of 50km to 150km of fiber length having 120mm bending radius. The inter-core crosstalk obtained herein is -220dB per 100km of fiber length.

Figure 2 illustrates a flow chart of the process for manufacturing multicore fiber cable in accordance with an embodiment of the present disclosure. At step 202, the process 200 includes implanting a plurality of trench assisted cores 102 of a predetermined diameter inside a fiber body 104 for conducting light to transmit data and electrical energy. The plurality of trench assisted cores 102 is prolonged along a length of the fiber body 104.

At step 204, the process 200 includes packing each of the cores 102 densely by a cladding 106 of a predetermined diameter and of a predetermined thickness. The predetermined diameter of the cladding 106 is 200µm and the predetermined thickness of the cladding 106 is 35µm.

At step 206, the process 200 includes optimizing parameters to achieve a minimum value of inter-core crosstalk by embedding the plurality of trench assisted cores 102 inside the fiber body 104 in a triangular lattice manner. The parameters including a refractive index of the cladding 106, trench-core, relative refractive index difference between core-cladding and cladding-trench. The inter-core crosstalk obtained herein is -220dB per 100km of fiber length.

At step 208, the process 200 includes suppressing propagation of unnecessary modes by incorporating a plurality of air-cores 108 of a predetermined diameter inside the fiber. The predetermined diameter of the plurality of air-cores 108 is 16µm. The crosstalk (XT) is suppressed to ultra-low level (ULXT) by suppressing the propagation of unnecessary modes by incorporating the plurality of air-cores 108 at selected places.

At step 210, the process 200 includes configuring the plurality of trench assisted cores 102 with the plurality of air-cores 108 into a multicore fiber (MCF) structure in an optical fiber-based communication to increase transmission capacity of the plurality of trench assisted cores 102. The 20 trench assisted cores 102 with 12 air-cores 108 multicore fibre (MCF) cable structure has been designed in an optical fiber-based communication paradigm to increase the transmission capacity by 20 times.

At step 212, the process 200 includes surrounding an intermediate region 110 by an outer coating 112 through which the plurality of trench assisted cores 102 along with the claddings 106 extend and thereupon controls the distribution of the optical mode field and reducing loss by the intermediate region 110 and the outer coating 112. The distribution of the optical mode field is controlled by the high refractive index of the outer coating 112 than that of the cladding 106 and the plurality of trench assisted cores 102.

Figure 3 illustrates an exemplary profile of a multicore fiber cable in accordance with an embodiment of the present disclosure. The figure 3 includes a plurality of trench assisted cores 102, plurality of air-cores 108 and cladding 106. The plurality of trench assisted cores 102 are of a 6µm diameter is embedded inside a fiber body 104 in order to transmit data and electrical energy in form of light. The plurality of air-cores 108 of a 16µm diameter is incorporated inside the fiber body 104, which is in association with the plurality of trench assisted cores 102 to suppress propagation of unnecessary modes. The cladding 106 provides a lower refractive index at the core interface in order to cause reflection within the core so that light waves are transmitted through the fiber.

In an embodiment, the 20 trench assisted cores 102 with 12 air-cores 108 multicore fiber (MCF) cable structure has been designed, where cores 102 are arranged in a triangular lattice manner by suitably optimizing the parameters to achieve the minimum value of crosstalk. In this system we have obtained inter-core crosstalk is -110dB per 100km of fiber length

In an embodiment, the parameters used for designing the disclosed multicore fiber cable includes a refractive index n0, n1 and n2 of the cladding 106, core and trench-core respectively, while, ?1 and ?2 represents the relative refractive index difference between core-cladding and cladding-trench, respectively. The refractive index of cladding 106 is n0 = 1.45. The relative refractive index difference between core-cladding is ?1 =0.70% whereas the relative refractive index difference between cladding-trench is ?2=-0.70%. The equivalent refractive index difference (?= ?1 + ?2) is ? =-1.40%.

In an embodiment, a ? represents the pitch which is defined as distance between any two neighboring cores calculated by using triangular lattice formula stated below:
((CD-2CT))/(2v7/3)=42.55µm

After calculating the pitch, the crosstalk value is calculated mathematically using the obtained neff value. The multicore fiber cable provides minimum value of Aeff of 89µm2.

In an embodiment, the crosstalk (XT) is suppressed to ultra-low level (ULXT). To suppress the propagation of unnecessary modes, the air-cores 108 at selected places is incorporated and the trench assisted cores 102 with refractive index profile is used. In an embodiment, a good arrangement among the number of air-core 108, air-core 108 diameter and crosstalk are designed. The single core fiber is replaced with the designed multicore fiber cable in an optical fiber-based communication paradigm to increase the transmission capacity by 20 times.

In an embodiment, the disclosed multicore fiber cable provides ultra-low level of inter core crosstalk i.e. -220dB per 100km of fiber length with minimum cladding 106 diameter providing high transmission capacity. The neff and Aeff values of disclosed multicore fiber cable are obtained as 1.4560311 and 89µm2 respectively.

Table 1: Illustrates comparison between disclosed fiber cable and prior art;
Parameter Disclosed Fiber Cable Prior Art
Core Diameter 16 µm 8 µm
Core to core pitch 35 µm 38 µm
No. of cores 20 7
Cladding Diameter 200µm 250 µm
Wavelength 1550nm 1200nm
R.I. difference b/w core and cladding 0.0070 O.OO58
R.I. difference b/w cladding and trench 0.0014 -O.OO12
Dispersion 3.8 ps/nm-km 10.5 ps/nm-km
No. of Air cores 4 of 6 µm diameter none
Crosstalk after air core -220 dB -38dB

In an embodiment, the Table 1 illustrates comparison between disclosed fiber cable and prior art. The prior art is designed on the 7 core MCF structure and diameter of each core is 8 µm, whereas the disclosed fiber cable is designed on 20 cores 102 with 4 air-cores 108 MCF structure, wherein the diameter of each core is 16 µm and has trench assisted step index refractive index profile along with four air-cores 108 of 6 µm diameter. In disclosed fiber cable, the cores are placed in special geometry i.e. in triangular lattice form and air-cores 108 are placed at selective position to reduce the inter core crosstalk to ultra-low level. The prior art has taken a cladding 106 of diameter 250 µm whereas cladding 106 of the disclosed fiber cable is of 200 µm diameter, which states that the greater number of cores 102 are accommodated in less space keeping core to core distance at 35 µm whereas the core to core distance of the prior art is 38µm. The refractive index profile is totally different, the disclosed fiber cable employs the trench assisted refractive index profile having relative refractive index difference between core-cladding and cladding-trench as 0.0070 and 0.0014 respectively, whereas the prior art employs 0.0058 and -0.0012 of relative refractive index difference between core-cladding and cladding-trench respectively. The operating wavelength of the disclosed fiber cable is 1550nm showing dispersion of 3.8 ps/nm-km whereas the operating wavelength of the prior art is 1200nm showing dispersion of 10.5 ps/nm-km, which states that the disclosed fiber cable shows much less dispersion even with higher number of cores 102. Along with all above factors the disclosed fiber cable has -220dB inter core crosstalk whereas crosstalk of the prior art is -38dB only.

Figures 4A and 4B illustrate a plurality of exemplary profiles of a multicore fiber cable with single ring, dual ring and triangular lattice in accordance with an embodiment of the present disclosure. The present disclosure includes a 20-core MCF with step index refractive index profile. The cores in three different structural manners including 1-Ring, 2-Ring and triangular Lattice are placed and thereupon observed that triangular lattice have the minimum value for crosstalk. After that the refractive index profile from step index to trench refractive index is changed for whole analysis. Further, it is observed that triangular lattice with trench assisted refractive index profile has minimum crosstalk. After that the crosstalk has been reduced to ultra-low crosstalk level by placing air core in between the cores. Furthermore, air-cores are placed at various positions and thereby found that cores that are placed in triangular lattice structure gives minimum crosstalk i.e. ULXT.
In an embodiment, the impacts of core diameter, core pitch, wavelength, transmission distance and fiber bending on the crosstalk behavior are examined and these parameters in an optimal way are selected. To reduce the cross-talk between different cores in our densely packed 20-core MCF, the trench assistance layer is used which will reduces the overlap of the electric field distribution among different cores. More than 20-30 dB is achieved by engineering the trench volume. So, the trench assisted (TA) core arrangement is implemented, which is used as an efficient technique to enhance the mode confinement area and it proves as an indispensable technique to suppress inter-core crosstalk to extremely low level. For further suppression of crosstalk (XT) to ultra-low level (ULXT), the selected air-cores has been also incorporated to suppress the propagation of unnecessary modes. A good arrangement among the number of air-core, air-core diameter and crosstalk are prepared. Our result confirms that the crosstalk reduces by about -10 dB with fiber length by placing only one air-core. Twelve air-cores at appropriate places are used that have reduced the crosstalk by 40 dB with fiber length. The performance of the disclosed cable is analyzed for different wavelengths, bending radius, core pitch, core diameter and fiber length.
Figures 5A, 5B, 5C, 5D, 5E, 5F, 5G, 5H, 5I, 5J, 5K AND 5L illustrates a plurality of exemplary graphs of a multicore fiber cable with single ring, dual ring and triangular lattice in accordance with an embodiment of the present disclosure. In an embodiment, the present invention facilitates designing and thereby analyzing step index refractive index based 20 Core MCF in which cores are arranged in three different manner as shown in Figures 5A, 5B, 5C, 5D, 5E, 5F, 5G, 5H, 5I, 5J, 5K AND 5L.
In an embodiment, the crosstalk for these three structures for different fiber parameters like wavelength, core pitch, core diameter and bending radius are analyzed. All the results are shown in Figures 5A, 5B, 5C, 5D, 5E, 5F, 5G, 5H, 5I, 5J, 5K AND 5L. It is observed that crosstalk has been reduced to -180dB for triangular lattice only. 2. Then a trench refractive index profile for each core in 20 core MCF has been applied to reduce the crosstalk and then the crosstalk for all the parameters are calculated again. It is found that crosstalk has reduced and found minimum in triangular lattice structure and its around -200dB.
In an embodiment, to further reduce the crosstalk to ultra-low level in triangular lattice, air-cores in between trench assisted cores are placed, wherein air-cores are placed at various positions and it is found the most suitable spot of placement for that as shown in Figure 3. Then, the crosstalk is calculated and thereupon found that crosstalk has reduced to the level of -220dB. The placement of air-cores has reduced the crosstalk to benchmark level. Results are shown in Figures 5A, 5B, 5C, 5D, 5E, 5F, 5G, 5H, 5I, 5J, 5K AND 5L. But after placing air core in triangular lattice structure at selected places, the crosstalk has been reduced further to -220dB.

The cable disclosed in accordance with the present disclosure does not degrade the transmission speed due to nonlinearities. The disclosure facilitates multicore fiber cable with minimal dispersion of light which results in adequate travelling of light along the fiber. The disclosed multicore fiber cable shows minimal group delay which promotes high data transmission and electrical energy transfer. The disclosed multicore fibre cable cope up with the high data rate demands of emerging technologies like 5G. The multicore fibre cable can be used in an optical network designing of smart cities to provide seamless network connectivity with negligible delay. The multicore fibre cable can be used for transmission of high data rate cables in data centres. The multicore fibre cable further is used in temperature sensors, strain sensors, space division multiplexing (SDM) transmission cables, supercomputing and the like.

The drawings and the forgoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment. For example, orders of processes described herein may be changed and are not limited to the manner described herein. Moreover, the actions of any flow diagram need not be implemented in the order shown; nor do all of the acts necessarily need to be performed. Also, those acts that are not dependent on other acts may be performed in parallel with the other acts. The scope of embodiments is by no means limited by these specific examples. Numerous variations, whether explicitly given in the specification or not, such as differences in structure, dimension, and use of material, are possible. The scope of embodiments is at least as broad as given by the following claims.

Benefits, other advantages, and solutions to problems have been described above with regard to specific embodiments. However, the benefits, advantages, solutions to problems, and any component(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential feature or component of any or all the claims.

Claims:1. A multicore fiber cable, the cable comprising:

a plurality of trench assisted cores of a predetermined diameter embedded inside a fiber body for conducting light to transmit data and electrical energy, wherein the plurality of trench assisted cores is prolonged along a length of the fiber body, wherein each of the cores is densely packed by a cladding of a predetermined diameter and of a predetermined thickness, wherein the plurality of trench assisted cores are embedded inside the fiber body in a triangular lattice manner by suitably optimizing parameters to achieve a minimum value of inter-core crosstalk;
a plurality of air-cores of a predetermined diameter incorporated inside the fiber body to suppress propagation of unnecessary modes, wherein the plurality of trench assisted cores with the plurality of air-cores are configured in a multicore fiber (MCF) structure in an optical fiber-based communication paradigm to increase transmission capacity of the plurality of trench assisted cores; and
an intermediate region surrounded by an outer coating through which the plurality of trench assisted cores and claddings extend, wherein the intermediate region and the outer coating are configured to control the distribution of the optical mode field and thereby reduces loss.

2. The cable as claimed in claim 1, wherein the plurality of trench assisted cores are selected from 15 to 25 trench assisted cores. More particularly of 20 trench assisted cores.

3. The cable as claimed in claim 1, wherein the predetermined diameter of the cladding is 200µm and the predetermined thickness of the cladding is 35µm.

4. The cable as claimed in claim 1, wherein predetermined diameter of the plurality of trench assisted cores is 6µm and predetermined diameter of the plurality of air-cores is 16µm.

5. The cable as claimed in claim 1, wherein the trench assisted cores are operating at a specific range of wavelength which is selected from 1500nm to 1600nm for a distance of 50km to 150km of fiber length having 120mm bending radius.

6. The cable as claimed in claim 1, wherein the inter-core crosstalk obtained herein is -220dB per 100km of fiber length.

7. The cable as claimed in claim 1, wherein the plurality of air-cores is selected from a range of air-cores including 10 to 15 air-cores. More particularly of 12 air-cores.

8. The cable as claimed in claim 1, wherein the outer coating protects intermediate coating, cladding and cores from the external effects, wherein external effects includes environmental temperature, external pressure, stress, strain and the like.

9. A process for manufacturing a multicore optical fiber cable, the method comprising:

implanting a plurality of trench assisted cores of a predetermined diameter inside a fiber body for conducting light to transmit data and electrical energy, wherein the plurality of trench assisted cores is prolonged along a length of the fiber body;
packing each of the cores densely by a cladding of a predetermined diameter and of a predetermined thickness;
optimizing parameters to achieve a minimum value of inter-core crosstalk by embedding the plurality of trench assisted cores inside the fiber body in a triangular lattice manner;
suppressing propagation of unnecessary modes by incorporating a plurality of air-cores of a predetermined diameter inside the fiber;
configuring the plurality of trench assisted cores with the plurality of air-cores into a multicore fiber (MCF) structure in an optical fiber-based communication to increase transmission capacity of the plurality of trench assisted cores; and
surrounding an intermediate region by an outer coating through which the plurality of trench assisted cores along with the claddings extend and thereupon controlling the distribution of the optical mode field and reducing loss by the intermediate region and the outer coating.

10. The process as claimed in claim 9, wherein the crosstalk (XT) is suppressed to ultra-low level (ULXT) by suppressing the propagation of unnecessary modes by incorporating the plurality of air-cores at selected places.